Investments (Tables)

3 Months Ended

Mar. 31, 2012

Investments [Abstract]

Long-Term Investment Portfolio [Table Text Block]

Investments	March 31, 2012	December 31, 2011
Millions
ALLETE Properties	$91.3	$91.3
Available-for-sale Securities	27.7	24.7
Other	16.7	16.3
Total Investments	$135.7	$132.3

ALLETE Properties	March 31, 2012	December 31, 2011
Millions
Land Inventory Beginning Balance (January 1, 2012 and 2011, respectively)	$86.0	$86.0
Deeds to Collateralized Property	—	1.8
Land Impairment	—	(1.7	)
Capitalized Improvements and Other	0.1	0.2
Cost of Real Estate Sold	—	(0.3	)
Land Inventory Ending Balance	86.1	86.0
Long-Term Finance Receivables (net of allowances of $0.6 and $0.6)	2.0	2.0
Other	3.2	3.3
Total Real Estate Assets	$91.3	$91.3